public async Task UserSetupUrl()
{
// Construct a V1 immediate request
Protocol protocol = Protocol.V11;
OpenIdProvider provider = this.CreateProvider();
var immediateRequest = new CheckIdRequest(protocol.Version, OPUri, DotNetOpenAuth.OpenId.AuthenticationRequestMode.Immediate);
immediateRequest.Realm = RPRealmUri;
immediateRequest.ReturnTo = RPUri;
immediateRequest.LocalIdentifier = "http://somebody";
var request = new AuthenticationRequest(provider, immediateRequest);
// Now simulate the request being rejected and extract the user_setup_url
request.IsAuthenticated = false;
Uri userSetupUrl = ((NegativeAssertionResponse)await request.GetResponseAsync(CancellationToken.None)).UserSetupUrl;
Assert.IsNotNull(userSetupUrl);
// Now construct a new request as if it had just come in.
var httpRequest = new HttpRequestMessage(HttpMethod.Get, userSetupUrl);
var setupRequest = (AuthenticationRequest)await provider.GetRequestAsync(httpRequest);
var setupRequestMessage = (CheckIdRequest)setupRequest.RequestMessage;
// And make sure all the right properties are set.
Assert.IsFalse(setupRequestMessage.Immediate);
Assert.AreEqual(immediateRequest.Realm, setupRequestMessage.Realm);
Assert.AreEqual(immediateRequest.ReturnTo, setupRequestMessage.ReturnTo);
Assert.AreEqual(immediateRequest.LocalIdentifier, setupRequestMessage.LocalIdentifier);
Assert.AreEqual(immediateRequest.Version, setupRequestMessage.Version);
}